“Ahmed, if you ever want to come by Facebook, I’d love to meet you,” Mark Zuckerberg posted on his Facebook page after that 14-year-old Texas boy was arrested for bringing to school a homemade clock that his teacher mistook for a bomb.

Just don’t pull any funny business around Zuckerberg’s new Dolores Heights home.

In addition to a new fence, the house is under 24-hour surveillance by a team of about 15 guards on rotating shifts.

And from the looks of things, the guards aren’t fooling around. Two months ago, Facebook lawyers obtained a restraining order on behalf of the guards after a 61-year-old transient living out of his car down the street began making racist rants and repeatedly threatened some of them, court records show.

In one instance the man, who later identified himself in court as part of a Christian army, walked up to a guard and said, “I have authorized Texas Rangers to investigate, and they tend to shoot now and ask questions later.”

The man has been arrested at least twice for disturbances near the home, including on the day after the restraining order took effect.

All was calm, however, the day we visited the neighborhood and saw three men gathered outside a sport utility vehicle — keeping a watchful eye on the home Zuckerberg and his wife, Dr. Priscilla Chan, moved into a few months back after a two-year renovation. A second, identical SUV with tinted windows was parked just across the street.

Photo: Eric Risberg, Associated Press

FILE - In this March 25, 2015 file photo, Mark Zuckerberg talks about the Messenger app during the Facebook F8 Developer Conference in San Francisco. For the first time, a billion people used Facebook in a single day on Monday, Aug. 24, 2015. Zuckerberg marked the occasion with a post on his Facebook page, saying that one out of seven people on Earth logged in to the social network to connect with their friends and family. (AP Photo/Eric Risberg)

FILE - In this March 25, 2015 file photo, Mark Zuckerberg talks...

A neighbor, 81-year-old Burke Ray, told us he regularly chats with the security crew and says they’re a friendly bunch. He also ran into Chan a little while ago while walking his dog. The two had a neighborly discussion about their Boston roots.

“She was very nice,” Ray said. “No attitude.”

Punt: Oakland officials are expected to pull the plug this week on the ambitious Coliseum City development plan that was intended to lay the groundwork for new stadiums for both the Raiders and A’s.

The plan was first rolled out in March 2012 by then-Mayor Jean Quan and local business leaders. The idea was to put together a public-private partnership that would transform the Coliseum site into a mega-sports, retail, tech and housing center that would bring as many as 32,000 jobs to the area.

Persuading someone to finance the plan, however, proved to be as elusive as a Raiders winning season — despite the city spending $3.5 million on various studies. At one point, Quan said the crown prince of Dubai was ready to pour a fortune into the project, but the royal money never materialized.

A year ago, Quan, who was fighting for re-election and desperate to keep the plan from dying, brought in San Diego businessman Floyd Kephart.

Kephart couldn’t deliver on his financing promises, but the fact that the City Council handed him exclusive negotiation rights kept the city from looking elsewhere as the Raiders, in particular, turned a wandering eye to other cities.

So what’s next?

“I think the city and county will try to negotiate directly with the two teams,” said Alameda County Supervisor Nate Miley, a member of the city-county Coliseum Authority. At the same time, the county will be working to sell its half of the site to the city.

Oakland Mayor Libby Schaaf said one of the biggest challenges will be to convince Raiders owner Mark Davis that there’s no way the city can pick up the tab for a $1 billion, football-only stadium — and that he may have to take on some new partners if he wants to finance a deal.

Davis, of course, could also decide to pull up stakes and head to the Los Angeles suburb of Carson, where he’s explored the possibility of building a joint stadium with the San Diego Chargers.

“I can lead a horse to water,” Schaaf told a fan during an audience Q&A at the Dreamforce convention in San Francisco last week, “but I need you to make Mr. Davis drink.”

Aquaponics combines fish farming with the practice of raising plants in water.

The jail program is having inmates grow edible plants. A quick search of the Web, however, also turned up plenty of links to aquaponics and cannabis, including a High Times article offering a one-day aquaponics marijuana-growing course.

“Any skill or science we teach inside the system can be hijacked,” Mirkarimi said. “But the alternative is worse in allowing incarcerated minds to decay.”

Put that in your pipe, and smoke it.

Botoxed? GOP presidential candidate Carly Fiorina, who just turned 61, reacted to Donald Trump’s remarks about her face by defiantly declaring ahead of Wednesday’s debate, “I’m proud of every year and every wrinkle.”

That is, if you can find a wrinkle.

San Francisco Chronicle columnists Phillip Matier and Andrew Ross appear Sundays, Mondays and Wednesdays. Matier can be seen on the KPIX TV morning and evening news. He can also be heard on KCBS radio Monday through Friday at 7:50 a.m. and 5:50 p.m. Got a tip? Call (415) 777-8815, or e-mail matierandross@sfchronicle.com. Twitter: @matierandross